Paper-cutting machine



March 9 1926.

C. SEYBQLD PAPER'CUTTING MACHINE Filed Oct. 24, 1923 2 Sheets-Sheet 1 Patented Mar. 9, 1926.

PATENT OFFICE.

CHARLES SEYBOLD, OF DAYTON, OHIO.

PAPER-CUTTING MACHINE.

Application filed October 24, 1923. Serial No. 670,571.

To all whom it may concern Be it known that I, Grannies Simeon), a citizen of the United States, and a resident of Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Paper- Cutting Machines, of which the following is a full, clear, and exact descript on, reference being had to the accompanying drawings, forming part of this spec fication.

The object of my invention 1s to provide a construction for the application of the pressure required for holding the piles of paper to be out or trimmed, in any of the ordinary types of power operatedpaper cutting machines, in which compression springs may be utilized for the application of the necessary clamping pressure which shall be automatically controlled to vary the pressure in proportion to the height of the pile, a moderate pressure when the pile is low and automatically increasing as the height of the pile increases.

Heretofore, so far as I am aware, compression springs have not been successful, for reason that inasmuch as the clamppulling bars must have a throw of a un form distance whether the pile of paper is high or low, it has been necessary to provide springs which would be capable of compressing an amount equal to the full movement of the clamp. With such springs the pressure on the high pile would not be sufiicient or if sufiicient, stiflf springs were employed for the high ile, it would be impossible to compress suc springs the extent required for the low pile without breakage.

It is to obviate this difiiculty that my invention is directed and it consists of that certain novel construction and arrangement of parts to be hereinafter particularly point.- ed out and claimed whereby the leverage exerted on the clamp bar shall be automatieally increased or diminished in proportion to the height of the paper p1le without the undue compression of the springs for the full throw of the clamp bar.

In the drawings:

Figure 1 is a side elevation of the frame of a paper cutter with my clamp mechanism applied thereto with the clamp in raised position.

Figure 2 is a perspective View of the same showing the clamp in low position.

Figure 3 is a front elevation of the clamp mechanism, and I Figure 4 is a plan view of the lever holding springs.

I have illustrated only such parts of the paper cutter as may be necessary to show the application of my invention to an ordinary paper cutter of typical construction, and it will be understood that the mechanism can readily be applied to any of a great variety of familiar types of machines. As illustrated, 1 is one of the side standards of such a machine with table 2, and end frame or housing 3, in which the cutting head with the knives, and the clamp bar 4 are mounted. The clamp rock shaft 5 is mounted on this housing with a clamp pressure lever 6 Se cured at each end of the clamp shaft to which levers the clamp bar 4 is swiveled by boxes 7 mounted in slots 8 in the clamp lever,9 and secured to the clamp 4 by wrist pins The outer end of one of these clamp levers 6 carries a roller 10 which is engaged by a pressure lever 12, having a curved track 13 upon which the roller rides. The outer end 14 of this pressure lever carries a swivel 15 in its slotted end to which a spring rod 16 is secured. The lower end of this spring rod is secured in a swivel 17, hinged to the nose 18 of a bracket casting 19 which is securely bolted to the side of the standard 1.

The spring rod 16 carries the compression spring 20 which surrounds the rod and bears at its lower end on the swivel 17, and at its upper end on a collar 21. The spring rod is of reduced diameter at this end and mounted to slide thereon is apressure adjusting nut 22. This nut has a screw threaded extension 23 which is screwed into the swivel 15 and through which the spring rod 16 passes. The outer end of the spring rod is threaded and carries a leather washer 24, and a steel Washer 25 with a nut 26 and lock nut 27 to hold the washers in place, normally with the leather washer bearing on the swivel 15.

The tension of the spring 20 is adjusted by the nut 22, which is provided with a number of radial holes 28 for the insertion of a rodor pin forturning. In order to, prevent too great a compression ofthe spring in careless adjustment, aprojection 30 I I pair of coiled springs 33.. These springs are guided on spring rod 34,.wh1ch is screwed Y bridge plate, and bymeans oftlie nut 38, the" into'tlie box 32. At the outer ends the springs are held in position by collars ,35 with a bridge plate-36 connecting the springs.

A centralg'uide rod 37 is provided screwed into the bracket 19 and. passing'through the 7 position of the sliding box .32-can headlower end'v to. arookerarm 40' which is in justed in" the bracket, 'while'fth'e tension of v I a paper'support, and a clamp bar to hold the paper pile von'the paper support, mechathe. springs33 adjusted by tlie nuts 39. v Thefpressnrelever 12 isl'pivoted -at its turn pivoted'at 11 to'thebox 32.j The rocker arm extends downwardly landsat its lower fend carriesa roller "42 whichfb'ears against of the machine.

a cam 43"fixedon'the front crankshaft 44 In the operation of the machine the cranl:

"shaft 11 and cam 43 rotate clockwise and this movement rocks the rocker arm and if there is no paper in the machine, the springs 33 which are ad usted nearly to their maximum compression limit, hold the box 32 and the pivot 41 of the rocker arm in fixed position while the compression spring 16 which is also adjusted to its maximum capacity holds the pressure lever 12 in position as if a continuation of the rocker arm. The result of rocking the rocker arm therefore, is to bring the lever 12 to bear on the roller 10 on the clamp lever 6, and to rockthe clamp shaft 5 and lower the clamp to the table. In. this movement the roller 10 rides up the curved surface of the lever 12, and the power of the lever 12, decreases and is at its minimum when the clamp reaches the table, or reaches a low pile of a few sheets of paper. When the pile of paper is reached, and the resistance of the paper pile exceeds the spring resistance of the compression springs, the further movement of the rocker arm, until the dwell of the cam is reached, causes the-spring 20 to compress and a slight space appears between the leather washer 24 and the swivel 15.

IVhen a high pile of paper is to be cut the clamp compresses the paper, when the roller 10 has moved only a slight distance on the lever 12, in which position the leverage is most powerful, the spring 20 compresses within its limits, which is only a short distance, and then to permit the full throw of the cam and rocker arm, the block 32 shifts urder the compression of the .springs 33.

The higher the pile the greater extent the slide block has to yield.

With this construction, it is obvious the full throw of the cam can be had without I any excessive compression'of the springs. I

amalso able to. employ comparatively light springs even toobtainvery powerful compression on the'pile when a full pile is unadopted being ,a coiled spring 45 mounted on the clamp shaft as is customary for raismg the clamp. Having thus; described my invention, what I I. 7;, operation, the clamp is I cl'aim as new and desire to secure by Let- I ters Patent,'is: A I I 1. Ina device of the character specified,

nism for operating the clamp bar to move 'it to the paper support,pow.er means for ultimate clamp pressure is applied, with resilient means at another point to permit the clamp mechanism to yield for the full operation of the power means while maintaining the tension of the first resilient means. I

2. In a device of the character specified, a paper support, and a clamp bar, and mechanism for operating the clamp bar to move it to the paper support, power means for actuating said mechanism, a spring operating on said mechanism at one point to hold the clamp under spring tension on the paper pile and through which resilient means the ultimate clamp pressure is applied, with spring means at another point to permit the mechanism to yield for the full operation of the power means while maintaining the tension of the first mentioned spring.

3. In a device of the character specified,

a paper support, and a clamp bar to hold power means, while maintaining the tension on the 'paper pile.

4. In a device of the character specified, a paper support, and a clamp bar to hold the paper'pile on the paper support, a rock shaft and connection therefor with the clamp bar to'operate same, a lever to rock the rock shaft, a spring operatin on the free end of said lever to hold the 0 amp under spring tension on the paper pile and through which the pressure is applied, a rock arm to which the lever is pivoted, a power driven cam to engage the rock arm and actuate the lever,

and a yieldable pivot for the rock arm, to permit the full throw of the cam while maintaining the tension on the paper pile.

5. In a device of the character specified, a paper support, and a clamp bar to hold the paper pile on the support, mechanism for operating the clamp bar to move it to the paper support, comprising in part a jointed lever with spring to hold the free end of the lever under tension and through which the ultimate pressure is applied, power means to actuate said lever and means to permit the lever to yield for the full opera tion of the power means while holding the lever under tension.

6. In a device of the character specified, a paper support, and a clamp bar to hold the paper pile on the support, mechanism for operating the clamp bar to move it to the paper support, comprising in part a jointed lever of two members with spring to hold the free end of the lever under tension and through which the ultimate pressure is applied, power means to actuate said lever, and a second spring means to permit the lever to yield for the full operation of the power means while holding the lever under tension.

7. In a device of the character specified, a paper support, and a clamp bar to hold the paper pile on the support, a jointed lever to actuate said clamp bar, a spring operating on the free end of said lever to hold the clamp under spring tension on the paper pile, and through which the ultimate pressure is applied, power means to actuate said lever, and means to permit the lever to yield for the full operation of the power means, wlliile maintaining the tension on the paper pi e.

8. In a device of the character specified, a paper support, and a clamp bar to hold the paper pile on the paper support, a rock shaft and connection therefor with the clamp bar to operate same, a lever to rock the rock shaft, a spring operating on said lever to hold the clamp under spring tension on the paper pile, a rock arm to which the lever is pivoted, a power driven cam to engage the rock arm and actuate the lever,

a slidable block on which said rock arm is pivoted with a spring to hold said block in position adapted to yield to permit the full throw of the cam while maintaining the tension on the paper pile.

CHARLES SEYBOLD. 

